Given a linked list, return the node where the cycle begins. If there is no cycle, returnnull. Follow up:Can you solve it without using extra space? 快慢指针找重合判断是否循环.而后fast从头开始+1,slow继续前进直到重合 思路解析: 首先我们看一张图; 设:链表头是X,环的第一个节点是Y,slow和fast第一次的交点是Z.各段的长度分别是a…
F - The Minimum Length Time Limit:1000MS Memory Limit:131072KB 64bit IO Format:%lld & %llu Submit Status Description There is a string A. The length of A is less than 1,000,000. I rewrite it again and again. Then I got a new string: AAAAAA...…
There is a string A. The length of A is less than 1,000,000. I rewrite it again and again. Then I got a new string: AAAAAA...... Now I cut it from two different position and get a new string B. Then, give you the string B, can you tell me the length…
Power Strings Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 47748 Accepted: 19902 Description Given two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = &quo…
Given two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = "abcdef". If we think of concatenation as multiplication, exponentiation by a non-negative integer is defin…